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 enough to be ominous. An instant of greyness is followed by a flash of sunlight as one emerges into the clear air. By the way, a flyer can dissipate a fairly small cloud by diving into it.

That is the fun of the clouds which look like "mashed potatoes." The big fellows can be much more serious. Once into them, and one has the sensation of being surrounded by an everlasting mass of grey, comparable, so far as visibility goes, with a heavy fog. In such clouds one can find all varieties of weather—rain, snow, or sleet.

In the trans-Atlantic flight, we encountered both rain and snow. There lies one of the greatest risks of long distance flying—I mean moisture freezing upon the wings of the plane. The danger zone of temperature is said to lie chiefly between twenty-four and thirty-eight degrees, when slush begins to form. Once in trouble of that kind, the pilot does his best to find warmer